"Cannot verify the identity of the remote computer because there is a time or date difference between your computer and the remote computer" is a Remote Desktop error that sounds like it is about the clock, and it actually is, almost every time. RDP relies on Kerberos and certificate based authentication that are both sensitive to clock drift, and once two machines fall out of sync by more than a few minutes, the connection refuses to authenticate.
Check the clock on both machines
Compare the date and time on the computer you are connecting from and the one you are connecting to. Even a small drift, sometimes just a few minutes, is enough to trigger this. Windows normally keeps itself in sync automatically, so seeing a real mismatch usually means time synchronization has stopped working on one side.
Fixing the underlying sync issue
On a domain joined machine, time should be syncing from the domain controller automatically. If it has drifted, check that the Windows Time service is actually running, and confirm the machine can reach its time source. On a machine that is not domain joined, confirm it is set to sync with an internet time server under Date and Time settings, and manually sync it if it has fallen behind.
A virtual machine that has been paused, snapshotted, or migrated between hosts is a particularly common source of this error, since the guest clock can drift significantly while the VM was not actively running, and it does not always correct itself automatically on resume.
If both clocks already match
Confirm the time zone setting is correct on both machines rather than just the clock time itself, since a wrong time zone can look correct at a glance but still represent a real difference in actual UTC time underneath. If both clock and time zone check out and the error persists, the certificate the remote machine is presenting for RDP may itself be expired or invalid, which is a separate issue from clock drift and worth checking next.
If server and workstation clock drift keeps causing issues like this across your environment, it is usually a sign your time synchronization setup needs a proper review. Our managed IT services team can help. Get in touch if that is where you are at.